John Laing Environmental Assets Group has bought the CSGH Solar Portfolio for £12.2 million.

It includes four solar parks that together generate 33.5MW.

The Higher Tregarne solar farm in Cornwall has been operating since March 2014 and has a generation capacity of 5MW, while the other three sites – Crug Mawr, Golden Hill and Shoals Hook – are all located in South Wales and have been operating since March 2015.

The company said it would use the cash to help recruit more customers.

Juliet Davenport, founder and chief executive, said: “Good Energy has a long history of customer ownership and we are thrilled at the success of this latest offer which demonstrates the continued significant support Good Energy enjoys from its customers and investors.”

French carmaker Renault has unveiled a deal with Powervault to turn used electric car batteries into domestic energy storage systems.Fifty M&S Energy customers will use the batteries as part of a trial.

Joe Warren, Managing Director of Powervault, said: “The collaboration with these two household name brands – Renault and M&S – is an important milestone on our journey towards achieving mainstream adoption of home energy storage.

“It’s only a matter of time before a Powervault becomes as common in households as a dishwasher.”